The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/604168304f0d95d0fbaf3775b2bd4e1a3ab5dab4

commit 604168304f0d95d0fbaf3775b2bd4e1a3ab5dab4
Author: xhwang <xhwang@chromium.org>
Date: Tue Apr 18 06:53:56 2017

media: Add UMA to record whether encrypted media is enabled

The UMA is recorded when requestMediaKeySystemAccess is called on
non-ClearKey key system but will reported at most once per renderer
process.

BUG= 711348 
TEST=Manually tested

Review-Url: https://codereview.chromium.org/2824643002
Cr-Commit-Position: refs/heads/master@{#465159}

[modify] https://crrev.com/604168304f0d95d0fbaf3775b2bd4e1a3ab5dab4/third_party/WebKit/Source/modules/encryptedmedia/NavigatorRequestMediaKeySystemAccess.cpp
[modify] https://crrev.com/604168304f0d95d0fbaf3775b2bd4e1a3ab5dab4/tools/metrics/histograms/histograms.xml

The CL has been verified in Canary. Request to merge to M59.

Your change meets the bar and is auto-approved for M59. Please go ahead and merge the CL to branch 3071 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), gkihumba@(ChromeOS), Abdul Syed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/935d9694edaf875ce825a7f8e7e2296c3152cb99

commit 935d9694edaf875ce825a7f8e7e2296c3152cb99
Author: Xiaohan Wang <xhwang@chromium.org>
Date: Thu Apr 20 16:29:58 2017

(merge m59) media: Add UMA to record whether encrypted media is enabled

The UMA is recorded when requestMediaKeySystemAccess is called on
non-ClearKey key system but will reported at most once per renderer
process.

BUG= 711348 
TEST=Manually tested

Review-Url: https://codereview.chromium.org/2824643002
Cr-Commit-Position: refs/heads/master@{#465159}
(cherry picked from commit 604168304f0d95d0fbaf3775b2bd4e1a3ab5dab4)

Review-Url: https://codereview.chromium.org/2834653002 .
Cr-Commit-Position: refs/branch-heads/3071@{#85}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}

[modify] https://crrev.com/935d9694edaf875ce825a7f8e7e2296c3152cb99/third_party/WebKit/Source/modules/encryptedmedia/NavigatorRequestMediaKeySystemAccess.cpp
[modify] https://crrev.com/935d9694edaf875ce825a7f8e7e2296c3152cb99/tools/metrics/histograms/histograms.xml